Z3
Public Member Functions | Data Fields
Tactic Class Reference

Public Member Functions

def __init__ (self, tactic, ctx=None)
 
def __deepcopy__ (self, memo={})
 
def __del__ (self)
 
def solver (self)
 
def apply (self, goal, arguments, keywords)
 
def __call__ (self, goal, arguments, keywords)
 
def help (self)
 
def param_descrs (self)
 

Data Fields

 ctx
 
 tactic
 

Detailed Description

Tactics transform, solver and/or simplify sets of constraints (Goal). A Tactic can be converted into a Solver using the method solver().

Several combinators are available for creating new tactics using the built-in ones: Then(), OrElse(), FailIf(), Repeat(), When(), Cond().

Definition at line 7252 of file z3py.py.

Constructor & Destructor Documentation

§ __init__()

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 7257 of file z3py.py.

7257  def __init__(self, tactic, ctx=None):
7258  self.ctx = _get_ctx(ctx)
7259  self.tactic = None
7260  if isinstance(tactic, TacticObj):
7261  self.tactic = tactic
7262  else:
7263  if __debug__:
7264  _z3_assert(isinstance(tactic, str), "tactic name expected")
7265  try:
7266  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
7267  except Z3Exception:
7268  raise Z3Exception("unknown tactic '%s'" % tactic)
7269  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
7270 
void Z3_API Z3_tactic_inc_ref(Z3_context c, Z3_tactic t)
Increment the reference counter of the given tactic.
Z3_tactic Z3_API Z3_mk_tactic(Z3_context c, Z3_string name)
Return a tactic associated with the given name. The complete list of tactics may be obtained using th...

§ __del__()

def __del__ (   self)

Definition at line 7274 of file z3py.py.

7274  def __del__(self):
7275  if self.tactic is not None and self.ctx.ref() is not None:
7276  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
7277 
void Z3_API Z3_tactic_dec_ref(Z3_context c, Z3_tactic g)
Decrement the reference counter of the given tactic.

Member Function Documentation

§ __call__()

def __call__ (   self,
  goal,
  arguments,
  keywords 
)
Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.

>>> x, y = Ints('x y')
>>> t = Tactic('solve-eqs')
>>> t(And(x == 0, y >= x + 1))
[[y >= 1]]

Definition at line 7312 of file z3py.py.

7312  def __call__(self, goal, *arguments, **keywords):
7313  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7314 
7315  >>> x, y = Ints('x y')
7316  >>> t = Tactic('solve-eqs')
7317  >>> t(And(x == 0, y >= x + 1))
7318  [[y >= 1]]
7319  """
7320  return self.apply(goal, *arguments, **keywords)
7321 

§ __deepcopy__()

def __deepcopy__ (   self,
  memo = {} 
)

Definition at line 7271 of file z3py.py.

7271  def __deepcopy__(self, memo={}):
7272  return Tactic(self.tactic, self.ctx)
7273 

§ apply()

def apply (   self,
  goal,
  arguments,
  keywords 
)
Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.

>>> x, y = Ints('x y')
>>> t = Tactic('solve-eqs')
>>> t.apply(And(x == 0, y >= x + 1))
[[y >= 1]]

Definition at line 7295 of file z3py.py.

Referenced by Tactic.__call__().

7295  def apply(self, goal, *arguments, **keywords):
7296  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7297 
7298  >>> x, y = Ints('x y')
7299  >>> t = Tactic('solve-eqs')
7300  >>> t.apply(And(x == 0, y >= x + 1))
7301  [[y >= 1]]
7302  """
7303  if __debug__:
7304  _z3_assert(isinstance(goal, Goal) or isinstance(goal, BoolRef), "Z3 Goal or Boolean expressions expected")
7305  goal = _to_goal(goal)
7306  if len(arguments) > 0 or len(keywords) > 0:
7307  p = args2params(arguments, keywords, self.ctx)
7308  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
7309  else:
7310  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
7311 
def args2params(arguments, keywords, ctx=None)
Definition: z3py.py:4766
Z3_apply_result Z3_API Z3_tactic_apply(Z3_context c, Z3_tactic t, Z3_goal g)
Apply tactic t to the goal g.
Z3_apply_result Z3_API Z3_tactic_apply_ex(Z3_context c, Z3_tactic t, Z3_goal g, Z3_params p)
Apply tactic t to the goal g using the parameter set p.

§ help()

def help (   self)
Display a string containing a description of the available options for the `self` tactic.

Definition at line 7322 of file z3py.py.

7322  def help(self):
7323  """Display a string containing a description of the available options for the `self` tactic."""
7324  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
7325 
Z3_string Z3_API Z3_tactic_get_help(Z3_context c, Z3_tactic t)
Return a string containing a description of parameters accepted by the given tactic.

§ param_descrs()

def param_descrs (   self)
Return the parameter description set.

Definition at line 7326 of file z3py.py.

7326  def param_descrs(self):
7327  """Return the parameter description set."""
7328  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
7329 
Z3_param_descrs Z3_API Z3_tactic_get_param_descrs(Z3_context c, Z3_tactic t)
Return the parameter description set for the given tactic object.

§ solver()

def solver (   self)
Create a solver using the tactic `self`.

The solver supports the methods `push()` and `pop()`, but it
will always solve each `check()` from scratch.

>>> t = Then('simplify', 'nlsat')
>>> s = t.solver()
>>> x = Real('x')
>>> s.add(x**2 == 2, x > 0)
>>> s.check()
sat
>>> s.model()
[x = 1.4142135623?]

Definition at line 7278 of file z3py.py.

7278  def solver(self):
7279  """Create a solver using the tactic `self`.
7280 
7281  The solver supports the methods `push()` and `pop()`, but it
7282  will always solve each `check()` from scratch.
7283 
7284  >>> t = Then('simplify', 'nlsat')
7285  >>> s = t.solver()
7286  >>> x = Real('x')
7287  >>> s.add(x**2 == 2, x > 0)
7288  >>> s.check()
7289  sat
7290  >>> s.model()
7291  [x = 1.4142135623?]
7292  """
7293  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx)
7294 
Z3_solver Z3_API Z3_mk_solver_from_tactic(Z3_context c, Z3_tactic t)
Create a new solver that is implemented using the given tactic. The solver supports the commands Z3_s...

Field Documentation

§ ctx

ctx

§ tactic

tactic